What is the best way to split a string into an array of Unicode characters in PHP?

user_36330 0
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In PHP, what is the best way to split a string into an array of Unicode characters? If the input is not necessarily UTF-8?

I want to know whether the set of Unicode characters in an input string is a subset of another set of Unicode characters.

Why not run straight for the mb_ family of functions, as the first couple of answers didn't?

unicode arrays php split
8 Answers

It's worth mentioning that since PHP 7.4 there's a built-in function, mb_str_split, that does this.

$chars = mb_str_split($str);

Unlike preg_split('//u', $str) this supports encodings other than UTF-8.

user_84212610 
function str_split_unicode($str, $l = 0) {
    if ($l > 0) {
        $ret = array();
        $len = mb_strlen($str, "UTF-8");
        for ($i = 0; $i < $len; $i += $l) {
            $ret[] = mb_substr($str, $i, $l, "UTF-8");
        }
        return $ret;
    }
    return preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY);
}
var_dump(str_split_unicode("لأآأئؤة"));

output:

array (size=7)
  0 => string 'ل' (length=2)
  1 => string 'أ' (length=2)
  2 => string 'آ' (length=2)
  3 => string 'أ' (length=2)
  4 => string 'ئ' (length=2)
  5 => string 'ؤ' (length=2)
  6 => string 'ة' (length=2)

for more information : http://php.net/manual/en/function.str-split.php

user_92487990

the best way for split with length: I just changed laravel str_limit() function:

    public static function split_text($text, $limit = 100, $end = '')
{
    $width=mb_strwidth($text, 'UTF-8');
    if ($width <= $limit) {
        return $text;
    }
    $res=[];
    for($i=0;$i<=$width;$i=$i+$limit){
        $res[]=rtrim(mb_strimwidth($text, $i, $limit, '', 'UTF-8')).$end;
    }
     return $res;
}
user_53200870
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